Yes. The Basel Convention and its amendments govern transboundary movement of plastic waste, including polystyrene scrap. US importers should confirm that the exporting country's competent authority has met applicable notification and consent requirements before shipment, as non-compliant loads can be refused entry or returned.

Customs classification requires that the material be identifiably composed of styrene polymers (e.g., polystyrene, ABS, SAN). Mixed or contaminated loads that cannot be identified by polymer type may fall instead under the residual plastics scrap heading, affecting both duty treatment and recyclability grading by downstream buyers.